Overview
EN ISO 10426-2:2003/A1:2005 is an amendment to ISO 10426-2 (Part 2: Testing of well cements) published by CEN/ISO for the petroleum and natural gas industries. Amendment A1 adds a standardized Water‑Wetting Capability Test (WWCT) to evaluate how well spacers and preflushes restore a water‑wet condition to surfaces exposed to oil‑ and synthetic‑based drilling fluids - a key factor for achieving reliable cement bonding and well integrity.
Key topics and technical requirements
Applications and users
- Used by drilling and cementing engineers, mud engineers, laboratory testing services, oilfield service companies, and well integrity specialists to:
- Select appropriate preflushes, spacers, or surfactant components before cementing.
- Demonstrate the ability of spacer systems to restore water‑wet surfaces after oil‑based drilling fluids.
- Support cement bond quality assurance and reduce gas migration risks.
Related standards
- This amendment is part of ISO 10426‑2 (Testing of well cements), prepared by ISO/TC 67 (materials and equipment for petroleum and natural gas industries). Users should consult the main ISO 10426‑2 document for full cement testing methods and requirements.
Keywords: well cementing, water‑wetting capability, WWCT, spacer testing, preflush, oil‑based drilling fluids, cement bonding, ISO 10426‑2, EN ISO 10426‑2:2003/A1:2005.
